174             if group.delimiter() == Delimiter::None {  in ignore_none()
195             _ => None,  in ident()
207             _ => None,  in punct()
217             _ => None,  in literal()
235             _ => None,  in lifetime()
245         if delim != Delimiter::None {  in group()
259         None  in group()
274         None  in any_group()
284         None  in any_group_token()
312             Entry::End(..) => return None,  in token_tree()
356             Entry::End(..) => return None,  in skip()
377                 _ => Delimiter::None,  in scope_delimiter()
405             None  in partial_cmp()